TECHNICAL FIELD

[0001] The present disclosure relates generally to mechanisms for providing an engine brake function, and more particularly to mechanisms and assemblies that enable a bleeder engine braking function in engines.

BACKGROUND

[0002] Engine brakes may be used as auxiliary brakes, in addition to wheel brakes, on vehicles. Engine braking methodologies may be based on compression release engine braking or bleeder engine braking. While particular compression release methodologies may be capable of relatively higher engine braking capabilities, related mechanisms for enabling such compression release engine braking can involve additional design complexity, weight, and/or cost. Such disadvantages may be based on requirements relating to relatively high loads based on high in-cylinder pressures that components may be subject to during engine braking operation. By contrast, bleeder engine braking and valvetrain systems may experience relatively lower loads and lower in-cylinder pressures during operation, and may thereby provide opportunities for inventive design and implementation of related mechanisms and assemblies. Further details of particular inventive embodiments are described herein.

[0003] The description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this section, as well as aspects of the description that cannot otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.

SUMMARY OF PARTICULAR EMBODIMENTS

[0004] In particular embodiments, a bleeder brake capsule is disclosed that is selectively operable in at least an engine braking mode and a drive mode, comprising a selective coupling mechanism further comprising a first crown and a second crown, the first and second crowns being coaxially located about a longitudinal axis, the first crown being capable of rotating about the longitudinal axis, the second crown being capable of longitudinal motion toward or away from the first crown, the first and second crowns being configured to selectively engage each other in a first position and a second position, wherein the first and second crowns are constrained to be longitudinally separated in the first position, and wherein the first and second crowns are configured to at least partially collapse or longitudinally overlap relative to each other in the second position, such that a combined length of the first and second crowns along the longitudinal axis is reduced in the second position relative to the first position; the bleeder brake capsule further comprising a plunger operatively coupled to the second crown such that the plunger is responsive to longitudinal motion of the second crown toward or away from the first crown; a biasing member acting to longitudinally separate the first and second crowns; and an actuator configured to selectively switch the first and second crowns between the first and second positions.

[0005] In particular embodiments, which may combine the features of some or all above embodiments, in the engine braking mode, the actuator is operated to switch the first and second crowns to the first position, and the plunger is extended by a predetermined distance to cause a brake valve of an engine cylinder to remain at least partially open throughout an engine cycle.

[0006] In particular embodiments, which may combine the features of some or all above embodiments, the selective coupling mechanism comprises a castellation mechanism, and the first and second crowns comprising teeth capable of selectively engaging with each other.

[0007] In particular embodiments, which may combine the features of some or all above embodiments, the teeth of the first and second crowns are rotationally disengaged in the first position, and the teeth of the first and second crowns are rotationally interlocked in the second position.

[0008] In particular embodiments, which may combine the features of some or all above embodiments, the actuator comprises an actuator pin and a pin biasing member, the actuator pin is configured to move between a first pin position and a second pin position, and the pin biasing member is configured to bias the actuator pin toward the second pin position.

[0009] In particular embodiments, which may combine the features of some or all above embodiments, the actuator pin is operatively coupled to the first crown such that the first crown rotates about the longitudinal axis based on the actuator pin moving between the first and second pin positions. [0010] In particular embodiments, which may combine the features of some or all above embodiments, the actuator is a hydraulic actuator, and pressurized oil is selectively communicated to the hydraulic actuator to move the actuator pin to the first pin position corresponding to the first position of the first and second crowns.

[0011] In particular embodiments, which may combine the features of some or all above embodiments, the actuator is an electromagnetic actuator comprising one or more electromagnets that are configured to be selectively energized to move the actuator pin between the first and second pin positions

[0012] In particular embodiments, which may combine the features of some or all above embodiments, in the engine braking mode, the plunger is stationary relative to an engine cylinder head throughout the engine cycle.

[0013] In particular embodiments, which may combine the features of some or all above embodiments, in the drive mode, the actuator is operated to switch the first and second crowns to the second position, the plunger is retracted based on a reduced combined length of the first and second crowns along the longitudinal axis, such that the brake valve of the engine cylinder operates independent of the bleeder brake capsule.

[0014] In particular embodiments, which may combine the features of some or all above embodiments, a bleeder brake system is disclosed comprising an engine braking carrier configured to be coupled to a cylinder head of an engine; a bleeder brake capsule disposed in the engine braking carrier; and an oil control valve assembly disposed in the engine braking carrier and configured to receive pressurized oil, the oil control valve assembly being further configured to selectively provide pressurized oil to activate, based on receiving an activation signal, the bleeder brake capsule; the bleeder brake capsule being configured to enable a cylinder of the engine to selectively operate in an engine braking mode and a drive mode, and the bleeder brake capsule further comprising a first coupler and a second coupler, the first and second couplers being configured to selectively engage each other in a first position and a second position, such that a combined length of the first and second couplers along a longitudinal axis in the first position is greater than the combined length in the second position; an actuator configured to selectively switch the first and second couplers between the first and second positions based on receiving pressurized oil from the oil control valve assembly; and a plunger operatively coupled to the second coupler and configured to selectively extend a predetermined distance. [0015] In particular embodiments, which may combine the features of some or all above embodiments, for a cylinder operating in the engine braking mode, the oil control valve assembly of a bleeder brake system provides pressurized oil to activate the actuator of the bleeder brake capsule, the activated actuator operates to switch the first and second couplers to the first position, and the plunger longitudinally extends by a predetermined distance to cause a brake valve of the cylinder to remain at least partially open throughout an engine cycle.

[0016] In particular embodiments, which may combine the features of some or all above embodiments, the bleeder brake system further comprises a second bleeder brake capsule, the oil control valve assembly is further configured to selectively provide pressurized oil to activate the second bleeder brake capsule, and the second bleeder brake capsule is configured to enable a second cylinder of the engine to selectively operate in an engine braking mode and a drive mode. [0017] In particular embodiments, which may combine the features of some or all above embodiments, the oil control valve assembly of a bleeder brake system is configured to selectively pressurize a common actuation oil gallery connected to each of the bleeder brake capsule and the second bleeder brake capsule.

[0018] In particular embodiments, which may combine the features of some or all above embodiments, the oil control valve assembly of a bleeder brake system is configured to receive pressurized oil from a rocker shaft of the engine, and the rocker shaft receives pressurized oil from an engine oil pump.

[0019] In particular embodiments, which may combine the features of some or all above embodiments, the actuator of a bleeder brake system comprises an actuator pin and a pin biasing member, the actuator pin is configured to move between a first pin position and a second pin position, the pin biasing member is configured to bias the actuator pin toward the second pin position, and the actuator pin is operatively coupled to the first coupler such that the first coupler rotates about the longitudinal axis based on the actuator pin moving between the first and second pin positions.

[0020] In particular embodiments, which may combine the features of some or all above embodiments, for the cylinder operating in the engine braking mode for a bleeder brake system, the plunger is stationary relative to the cylinder head throughout the engine cycle.

[0021] In particular embodiments, which may combine the features of some or all above embodiments, for the cylinder operating in the drive mode, the oil control valve assembly of a bleeder brake system is operated to release oil pressure and deactivate the actuator of the bleeder brake capsule, and the deactivated actuator is operated to switch the first and second couplers to the second position, thereby retracting the plunger such that the brake valve of the cylinder operates independent of the bleeder brake system.

[0022] In particular embodiments, which may combine the features of some or all above embodiments, a method of operating a bleeder brake capsule is disclosed, the method comprising, in an engine braking mode of the bleeder brake capsule, operating an actuator to switch a first crown and a second crown to a first relative position, the bleeder brake capsule comprising the actuator, the first and second crowns, and a plunger, the first and second crowns being configured to selectively engage each other in at least a first relative position and a second relative position based on operation of the actuator, such that a total length of the first and second crowns along a longitudinal axis in the first relative position is greater than the total length in the second relative position; and extending the plunger a predetermined distance based on the first and second crowns occupying the first relative position such that the plunger prevents a brake valve of an engine cylinder from fully closing throughout an engine cycle.

[0023] In particular embodiments of a method of operating a bleeder brake capsule, which may combine the features of some or all above embodiments, the actuator comprises an actuator pin, such that the first crown selectively rotates about the longitudinal axis based on the actuator pin moving between at least a first pin position and a second pin position.

[0024] In particular embodiments of a method of operating a bleeder brake capsule, which may combine the features of some or all above embodiments, the actuator is a hydraulic actuator, and wherein pressurized oil is selectively communicated to the hydraulic actuator to move the actuator pin between the first and second pin positions.

[0025] In particular embodiments of a method of operating a bleeder brake capsule, which may combine the features of some or all above embodiments, the actuator is an electromagnetic actuator comprising one or more electromagnets, the one or more electromagnets configured to be selectively energized to move the actuator pin between the first and second pin positions.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in greater detail below based on the exemplary figures. The invention is not limited to the exemplary embodiments. Other features and advantages of various embodiments of the present invention will become apparent by reading the following detailed description with reference to the attached drawings which illustrate the following:

[0027] FIG. 1 illustrates a schematic perspective view of a carrier-based assembly for enabling bleeder engine braking, according to particular embodiments.

[0028] FIG. 2A illustrates a schematic perspective partial ghost view of a carrier-based assembly for enabling bleeder engine braking, also illustrating particular internal features and particular optional hydraulic connections, according to particular embodiments.

[0029] FIG. 2B illustrates a schematic partial sectional view of a carrier-based assembly, along with optional hydraulic connections, for enabling bleeder engine braking, according to particular embodiments.

[0030] FIG. 2C illustrates a schematic partial sectional view of a carrier-based assembly for enabling bleeder engine braking, along with a bleeder brake capsule and optional hydraulic connections, according to particular embodiments.

[0031] FIG. 2D illustrates a schematic partial sectional view of an actuator mechanism of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments.

[0032] FIG. 3A illustrates a schematic partial sectional front view of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments.

[0033] FIG. 3B illustrates a schematic partial sectional top view of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments.

[0034] FIG. 3C illustrates a schematic perspective view of a bottom crown of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments.

[0035] FIG. 4A illustrates a valve lift diagram versus engine crank angle in a drive mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments.

[0036] FIG. 4B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments. [0037] FIG. 4C illustrates a schematic enlarged partial side view of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments.

[0038] FIG. 4D illustrates a schematic sectional partial side view of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments. [0039] FIG. 5A illustrates a valve lift diagram versus engine crank angle in a drive mode of a bleeder engine braking system, during a main exhaust stroke, according to particular embodiments. [0040] FIG. 5B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments.

[0041] FIG. 5C illustrates a schematic enlarged partial side view of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments.

[0042] FIG. 5D illustrates a schematic sectional partial side view of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments.

[0043] FIG. 6A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments.

[0044] FIG. 6B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments.

[0045] FIG. 6C illustrates a schematic enlarged partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. [0046] FIG. 6D illustrates a schematic sectional partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments.

[0047] FIG. 7A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, during a main exhaust stroke, according to particular embodiments.

[0048] FIG. 7B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments.

[0049] FIG. 7C illustrates a schematic enlarged partial side view of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments.

[0050] FIG. 7D illustrates a schematic sectional partial side view of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments.

[0051] FIG. 8A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments. [0052] FIG. 8B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments.

[0053] FIG. 8C illustrates a schematic enlarged partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. [0054] FIG. 8D illustrates a schematic sectional partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments.

[0055] FIGs. 9A-9B illustrate a schematic partial sectional top view and operation of an actuator for a bleeder brake capsule, according to particular embodiments.

[0056] FIG. 10A illustrates a step in a lash setting procedure for a bleeder brake capsule, according to particular embodiments.

[0057] FIGs. 10B1-10B2 illustrate additional steps in a lash setting procedure for a bleeder brake capsule, according to particular embodiments.

[0058] FIGs. 10C1-10C2 illustrate additional steps in a lash setting procedure for a bleeder brake capsule, according to particular embodiments.

[0059] FIG. 10D illustrates an additional step in a lash setting procedure for a bleeder brake capsule, according to particular embodiments.

[0060] FIG. 10E illustrates an additional step in a lash setting procedure for a bleeder brake capsule, according to particular embodiments.

[0061] It should be noted that figures provided may be illustrated schematically rather than literally or precisely; components and aspects of the figures may also not necessarily be to scale. Moreover, while like reference numerals may designate corresponding parts throughout the different views in many cases, like parts may not always be provided with like reference numerals in each view.

DESCRIPTION OF EXAMPLE EMBODIMENTS

[0062] In accordance with various embodiments of the present disclosure, bleeder brake assemblies and related mechanisms, devices, and methodologies are provided herein. For clarity, not all features of each actual implementation or embodiment may be described in this specification. Additionally, some aspects and features may be described at a high level. Further, features and aspects that are disclosed, illustrated, and/or apparently otherwise contemplated in certain specific configurations are fully contemplated to be mixed or combined to produce any and all resulting configurations using features and aspects from any embodiments and/or configurations considered herein. Thus, modifications, variations, adaptations, and/or combinations of features and aspects may be made that result in embodiments that are fully contemplated to fall within the scope of this disclosure.

[0063] In contrast to methodologies of compression release engine braking, particular approaches to bleeder engine braking may involve opening and/or holding open exhaust valves designated for engine braking during some or all parts of an engine cycle such as to prevent relatively high cylinder pressures from building up and acting on components and mechanisms associated with engine braking. Separately or additionally, compression release mechanisms may require synchronization with the engine cycle, and/or require design for motion of braking mechanism parts at engine cycle-based frequencies, which can significantly increase the complexity of the design and implementation. As an illustrative example, compression release engine braking may be integrated into an engine valvetrain based on a rocker mechanism, and may dynamically operate based on a rocker mechanism at engine cycle-relevant frequencies.

[0064] Particular embodiments of bleeder engine braking mechanisms may be inventively designed with relative advantages of mechanical simplicity, fewer moving parts, lower weight and cost, lower criticality of designing for dynamics, and/or ability to more easily bolt-on, retrofit or otherwise modify an existing design, as some non-limiting benefits.

[0065] In particular embodiments, an active engine braking may refer to an approach wherein engine braking may be explicitly and selectively activated by an operator, as opposed to passive engine braking, wherein engine braking operation may be passively activated based on satisfaction of predetermined operating conditions, such as threshold values of exhaust manifold pressure.

[0066] FIG. 1 illustrates a schematic perspective view of a carrier-based assembly 10 for enabling bleeder engine braking, according to particular embodiments. FIG. 2A illustrates a schematic perspective partial ghost view of a carrier-based assembly for enabling bleeder engine braking, also illustrating particular internal features and particular optional hydraulic connections, according to particular embodiments.

[0067] In particular embodiments, carrier-based assembly 10 may comprise one or more bleeder brake capsules 26, corresponding to cylinders of an engine to be enabled for bleeder engine braking capability. In particular embodiments, each bleeder brake capsule 26 may be aligned such that it may guide a guided exhaust valve assembly 20 of a corresponding cylinder. [0068] Particular embodiments of bleeder brake mechanisms and/or assemblies disclosed herein may be particularly suitable to be deployed as after-market or other modification(s) to existing engines. As a non-limiting example, particular embodiments of bleeder brake mechanisms may comprise mechanical parts that may experience little or no motion at time scales of engine cycles and cam or crank rotation, and/or may not be required to synchronize and/or otherwise integrate with complex fast-moving valvetrain components (in contrast to rocker arm-based compression release mechanisms, as a non-limiting counter-example). As another non-limiting example, particular embodiments of bleeder brake mechanisms may be hydraulically controlled, and may readily tap into existing sources of pressurized oil from the base engine.

[0069] In particular embodiments, carrier-based assembly 10 may be designed to be a bolt-on modification for existing engines and/or engine designs, such that the assembly may enable bleeder braking functionality with minimal changes required to the base engine. As a non-limiting example, engine braking carrier 14 of a carrier-based assembly 10 may comprise bolt holes 22, attachment points, and/or other devices or features for easily coupling carrier-based assembly 10 to the cylinder head of an engine (not shown).

[0070] While engine braking carrier 14 may be specifically disclosed in particular forms, such as by illustrative examples disclosed herein, it should be appreciated that engine braking carrier 14 is contemplated to take any structural form(s) to suitably contain, connect, supply, and/or otherwise support bleeder brake capsules 26, whether individually, collectively, and/or in particular groupings.

[0071] As a non-limiting example, bleeder brake capsules 26 may be hydraulically actuated. In particular embodiments, one or more Oil Control Valves (OCVs) 18 may provide active control of selectively activating one or more bleeder brake capsules 26. By way of illustration and not limitation, a single OCV 18 may be used to control multiple bleeder brake capsules 26 by selectively enabling a pressurized hydraulic fluid or control fluid, such as oil, to be communicated to corresponding bleeder brake capsules 26 through suitable actuation oil galleries 42.

[0072] In a non-limiting example illustrated in FIGs. 1 and 2A, a single OCV 18 may control four bleeder brake capsules 26 via a single actuation oil gallery 42. In particular embodiments, access to a pressurized supply for a hydraulic fluid or control fluid, such as oil, may be enabled by tapping an existing pressurized engine oil conduit. As a non-limiting example, engines may commonly carry pressurized oil in channels within a rocker shaft 34. As such, in particular embodiments, a rocker shaft bolt location 38 of rocker shaft 34 may be tapped to access a supply of pressurized engine oil as a control and/or hydraulic fluid for selectively activating bleeder brake capsules 26, such as from an engine oil pump.

[0073] It should be recognized that although this disclosure describes modifying, assembling, and/or coupling particular mechanisms and/or assemblies to base engines in particular ways and describes applications of particular suitability, these descriptions are entirely non-limiting. For instance, this disclosure contemplates providing any suitable mechanism and/or assembly for any suitable method of coupling, modifying, integral design, and/or use with a base engine in any suitable manner.

[0074] FIG. 2B illustrates a schematic partial sectional view of a carrier-based assembly 10, along with optional hydraulic connections, for enabling bleeder engine braking, according to particular embodiments. As a non-limiting example, a rocker shaft 34 may be tapped at a rocker shaft bolt location 38 to communicate pressurized oil to Oil Control Valve (OCV) 18. In particular embodiments, based on receiving a signal to activate or deactivate an engine braking mode, OCV 18 may selectively connect pressurized oil supply communication to actuation oil gallery 42 of one or more bleeder brake capsules 26. As a non-limiting example, all bleeder brake capsules 26 may be connected to a common actuation oil gallery 42, and may thereby be all activated or all deactivated in tandem based on control based on a single OCV 18.

[0075] FIG. 2C illustrates a schematic partial sectional view of a carrier-based assembly for enabling bleeder engine braking, along with a bleeder brake capsule and optional hydraulic connections, according to particular embodiments. In particular embodiments, actuation oil gallery 42 may be connected to an actuator, or actuator mechanism, 50 of bleeder brake capsule 26 via an actuation oil channel 46.

[0076] FIG. 2D illustrates a schematic partial sectional view of an actuator mechanism of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments. In particular embodiments, actuator mechanism 50 may comprise an actuation pin 104 configured to move within an actuation bore or passage. In specific embodiments, actuation pin 104 may selectively translate within an actuation bore 106 based on instantaneous differential forces applied at its ends. In particular embodiments, pressurized oil may be selectively supplied through actuation oil channel 46 to act on one end of actuation pin 104. In particular embodiments, a biasing member 108 may act on an end of actuation pin 104, which may be a different end than that acted upon by pressurized oil. As a non-limiting example illustrated by FIG. 2D, biasing member 108 may act to bias actuation pin 104 opposing an oil pressure selectively acting on actuation pin 104 via actuation oil channel 46. An actuation cap 112 may be provided to close actuation bore 106, in particular embodiments, with an optional purge hole 116. In particular embodiments, actuation pin 104 may be provided with multiple acting and/or biasing members or sources.

[0077] In particular embodiments, actuation pin 104 may be biased closed when actuator 50 is deactivated or de-energized. As a non-limiting illustrative example, in the frame of reference of FIG. 2D, biasing member 108 may act to force actuation pin 104 to the right. In the absence of sufficient counter-acting force, i.e., in a deactivated or de-energized state, such as when engine braking is not enabled (also called a “drive mode”), actuation pin 104 may therefore move to a rightward position within actuation bore 106. When engine braking is enabled, a suitable leftward acting force may then be supplied to actuation pin 104. For instance, pressurized oil may be supplied to actuator 50 through actuation oil channel 46 to act on the right end of actuation pin 104, such that actuation pin 104 may translate leftward against the biasing force of biasing member 108, until the force due to to the pressurized oil on one end (the right end, in the frame of reference of FIG. 2D) may be balanced by the biasing force on the other end (the left end due to a compressed spring, in the non-limiting example and frame of reference of FIG. 2D). Consequently, referring back to the frame of reference and illustrative example of FIG. 2D, the actuation pin 104 in its leftmost position may represent the actuator 50 in its activated or energized state in this example. [0078] In other embodiments, an activation or energizing force in an enabled or activated state may be provided by one or more other transducers or members, such as electromagnet 120 illustrated in FIGs. 9A and 9B for an electromagnetic actuator 50.

[0079] In particular embodiments, actuation pin 104 may be provided with means to act on one or more members of bleeder brake capsule 26, such as to translate a motion of actuation pin 104 based on activating or deactivating actuator 50 to a motion or other change of state of bleeder brake capsule 26. By way of example and not limitation, in particular embodiments, actuation pin 104 may be provided with gears or other coupling means to operatively engage with a suitable member of bleeder brake capsule 26, such as by a rack-and-pinion mechanism, or by a worm and/or worm wheel mechanism. [0080] In particular embodiments, a bleeder brake capsule 26 may comprise a selective coupling mechanism, such as a castellation mechanism, and/or may further comprise one or more couplers, such as one or more crowns coaxially located about a longitudinal axis. With reference to an exemplary illustration of FIG. 2D, actuation pin 104 may engage with upper crown 204 of bleeder brake capsule 26 via a mutual gearing mechanism, such that translation or switching of actuation pin 104 between its deactivated and activated positions may rotate or otherwise switch upper crown 204 between corresponding deactivated and activated rotational positions about a longitudinal rotational axis of upper crown 204.

[0081] FIG. 3 A illustrates a schematic partial sectional front view of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments. In particular embodiments, bleeder brake capsule 26 may comprise an upper crown 204 configured to selectively rotate about a longitudinal axis L-L. In particular embodiments, upper crown 204 may be selectively acted upon by motion of actuation pin 104 to enable selective rotation of upper crown 204 about longitduninal axis L-L. As a non-limiting example, upper crown 204 may be provided with teeth and/or other forms of gearing, such as an actuator interfacing gearing 205 (illustrated in at least FIGs. 3B and 4C) to engage with actuation pin 104, and/or upper crown 204 may be otherwise receptive to selective rotation based on motion of actuation pin 104.

[0082] In particular embodiments, in an assembled and operational state of bleeder brake capsule 26, upper crown 204 may be constrained such that relative translation of upper crown 204 is prevented along longitudinal axis L-L, relative to an outer casing of the bleeder brake capsule 26, such as engine braking carrier 14. Stated differently, in particular embodiments, upper crown 204 may be permitted to selectively rotate about L-L, but not linearly translate. In particular embodiments, upper crown 204 may be longitudinally supported, constrained, and/or otherwise rest on a supporting member within bleeder brake capsule 26, such as a washer 236.

[0083] In particular embodiments, upper crown 204 may be provided with gearing, teeth, or other suitable coupling means to selectively engage with corresponding features providing on a lower crown 208. In particular embodiments, specific coupling means between upper crown 204 and lower crown 208 may provide, when engaged, relative rotational interlocking between upper crown 204 and lower crown 208.

[0084] In particular embodiments, specific coupling means, which may be shared with or may not necessarily be identical to the means referred to and employed as in the preceding paragraphs, may enable a plurality of stable relative longitudinal positions for a selective coupling mechanism comprising the upper crown 204 and lower crown 208. In particular embodiments, a plurality of stable relative longitudinal positions for the selective coupling mechanism may be based on, and/or selected by, providing one or more relative rotational positions between the upper crown 204 and lower crown 208. As a non-limiting example, castellation teeth 214 may be provided on upper crown 204 and lower crown 208 for selective mutual engagement and operability. A non-limiting exemplary illustration of castellation teeth 214 is provided in at least FIG. 4C. Features, aspects, and interoperation of a selective coupling mechanism for enabling bleeder brake capsule operation will be further described herein.

[0085] In particular embodiments, lower crown 208 may be structurally constrained to prevent rotation about longitudinal axis L-L, such as by an anti-rotation tab. An anti-rotation tab 209 is illustrated in FIG. 3C as a non-limiting example.

[0086] In particular embodiments, lower crown 208 may be structurally enabled to selectively longitudinally translate along longitudinal axis L-L. In particular embodiments, upper crown 204 may be provided with one or more structural features, such as a long tooth 206, to enable constraint of longitudinal translation of upper crown 204, such as by resting or otherwise longitudinally supporting upper crown 204 on washer 236. In particular embodiments, one or more slots, keyways, and/or other passageways may be provided in lower crown 208 to permit supporting structural features of upper crown 204, such as long tooth 206, to pass through lower crown 208 and enable longitudinal constraint and/or support of upper crown 204 within bleeder brake assembly 26. Slot 210, as illustrated in FIG. 3C, is a non-limiting example of such a slot or keyway that may be provided in lower crown 208.

[0087] In particular embodiments, a biasing member 212, such as a spring, may provide a longitudinally separating biasing action on lower crown 208 relative to upper crown 204. With reference to a non-limiting example illustrated in FIG. 3A, while upper crown 204 may selectively rotate about L-L but may rest on washer 236 by long tooth 206 and thereby not be free to translate along L-L, lower crown 208 may not rotate about L-L, but may experience a separating force by biasing member 212 pushing away (downward) lower crown 208 from upper crown 204 along longitudinal axis L-L.

[0088] In particular embodiments, bleeder brake capsule 26 may comprise a plunger or an extended member, which may be coupled to, or may be formed integral with, a non-rotating coupling member enabled for translation along L-L. With reference to the illustrative example of FIG. 3A, a plunger 216 may be coupled to lower crown 208, such as by a threaded coupling. In particular embodiments, plunger 216 may be formed integral with lower crown 208. In particular embodiments, a nut or other accessible turning means, such as nut 220, may be provided, and/or may be otherwise operatively coupled to plunger 216, such as by a threaded coupling.

[0089] Nut 220 may be formed to provide a hard mechanical stop for plunger 216 along at least one direction of motion along the longitudinal axis L-L. By way of example and not limitation, FIG. 3A illustrates a nut 220 that may interfere with a casing or fixed outer structure of bleeder brake capsule 26, such as engine braking carrier 14, and prevent downward motion (in the frame of reference of this figure) of plunger 216 past a longitudinal extent of interference. Stated differently, nut 220 may be configured to adjustably fix a maximum downward travel of plunger 216. As will be further described herein, in particular embodiments, a valve lift distance for acting on an exhaust valve for engine braking , and/or additional gaps such as mechanical lash, may be configured for a bleeder brake capsule 26 based on suitably adjusting a relative location (or gap) for a hard stop or interference location by adjusting threaded or other means of coupling between nut 220 and plunger 216.

[0090] In particular embodiments, an end of plunger 216, such as an end opposite to the interface with nut 220, may be adapted to selectively connect with, interface with, and/or otherwise act upon one or more exhaust valves of an engine.

[0091] In particular embodiments, an exhaust valve of an engine intended and/or designated for use for engine braking aspects may be called a brake valve. As a non-limiting example, for an engine cylinder comprising two exhaust valves, one of the two exhaust valves may be designated to be a brake valve, and the other exhaust valve may be designated to be a main exhaust valve.

[0092] In particular embodiments, in a drive mode indicating disablement of engine braking operation, both exhaust valves (main exhaust and brake) may operate in tandem and/or otherwise normally open and close independent of bleeder brake capsule operation. In particular embodiments, in an engine braking mode, while a main exhaust valve may continue to open and close substantially normally, i.e., as in its drive mode operation, operation of a brake valve may be modified by a bleeder brake capsule or assembly to enable bleeder engine braking.

[0093] As illustrated in the non-limiting example of FIG. 3A, in particular embodiments, an exhaust valvetrain for an engine cylinder may comprise a valve bridge 232, whereby a rocker arm or other mechanism for operating exhaust valves may act on the exhaust valves. In particular embodiments, an end of plunger 216 may be configured to act on a subset of exhaust valves intended for engine braking, such as a brake valve (not shown). In particular embodiments, a pin or bridge socket 224 may provide access for plunger 216 to a brake valve (not shown) by passing through valve bridge 232. As an exemplary illustration, socket end 228 may receive an end of a valve stem of the brake valve, such that plunger 216 may selectively act to exert an opening or lifting force on the brake valve. In contrast to compression release mechanisms, which may involve one or more valve-opening structures that rotate, oscillate, and/or otherwise move relative to the engine cylinder head, such as by coupling to a moving rocker arm, plunger 216 of particular embodiments of bleeder brake mechanisms and assemblies disclosed herein may not move relative to an engine cylinder head frame of reference, once a steady state mode operation is established. [0094] Although this disclosure describes means for bleeder brake capsule 26 and/or plunger 216 to act on a brake valve or a guided exhaust valve assembly 20 of an engine cylinder in a particular manner, this disclosure contemplates providing any suitable means of acting on a brake valve or a guided exhaust valve assembly in any suitable manner.

[0095] FIG. 3B illustrates a schematic partial sectional top view of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments. FIG. 3C illustrates a schematic perspective view of a bottom crown of a bleeder brake capsule for enabling bleeder engine braking, according to particular embodiments. An exemplary coupling interface between actuation pin 104 of actuator 50 and upper crown 204 is illustrated in the form of actuator interface gearing 205. As a non-limiting example, in the frame of reference of FIG. 3B, actuation pin 104 may move to an ‘off or engine braking disabled or drive mode position toward the right of the figure, rotating upper crown 204 counter-clockwise to a corresponding angular position for drive mode; actuation pin 104 may conversely move to an ‘on’ or engine braking enabled position toward the left of the figure, rotating upper crown 204 clockwise to a corresponding angular position for enabling engine braking. In particular embodiments, a total rotational or angular displacement of upper crown 204 based on the switching traversal of actuation pin 104 between the ‘on’ and ‘off’ positions may correspond to a gear pitch or an intertooth width or intertooth angle between adjacent similar gear elements of castellation teeth 214.

[0096] In particular embodiments, upper crown 204 and lower crown 208 may be configured to selectively engage each other in particular positions. As a non-limiting example, based on two positions of actuation pin 104, a one (“first position” in this paragraph’s discussion of this embodiment) corresponding to an energized/activated/’on’/engine brake mode, the other (“second position” in this paragraph’s discussion of this embodiment) corresponding to a de- energized/deactivated/’off/drive mode, upper crown 204 and lower crown 208 may have two corresponding relative positions: respectively, the first position with the upper crown 204 held longitudinally separated from lower crown 208, occupying a larger combined length along the longitudinally axis; the second position with the upper crown 204 collapsed or longitudinally overlapping with lower crown 208, such that the pair of crowns may occupy a reduced combined length or extent along the longitudinal axis. In particular embodiments, respective castellation teeth 214 of upper crown 204 and lower crown 208 may be rotationally disengaged in the first position. In particular embodiments, respective castellation teeth 214 of upper crown 204 and lower crown 208 may be rotationally interlocked in the second position.

[0097] FIGs. 4A-4D illustrate aspects of a bleeder engine braking system in a drive mode, with an exhaust cam on base circle, according to particular embodiments.

[0098] FIG. 4A illustrates a valve lift diagram versus engine crank angle in a drive mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments. In particular embodiments, in a drive mode or engine braking disabled mode, a main exhaust valve and a brake (exhaust) valve may operate in tandem through an engine cycle. Such a system is illustrated herein, as a non-limiting example. A cam of an exhaust camshaft (not shown) may provide exhaust valve lift at particular phases, or crank angles, of an engine cycle. With reference to FIGs. 4A-4D, an instant corresponding to a base circle position of such an exhaust cam, i.e., a minimum valve lift position, is illustrated. The relative timing position within the engine cycle illustrated by FIGs. 4A-4D is schematically marked with a solid diamond in FIG. 4A. [0099] FIG. 4B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments. By way of non- limiting example, an Oil Control Valve 18 may restrict or otherwise disable supply of pressurized oil to actuator 50 in drive mode. Consequently, in particular embodiments, actuation oil channel 46 may provide oil at a relatively low pressure to actuator 50. Based on a low force acting on the right end of actuation pin 104 (in the frame of reference of the figure), biasing member 108 may displace actuation pin 104 to the right end of actuation bore 106, thereby acting to rotate upper crown 204 (located behind actuation pin 104 in this view) about a longitudinal axis, as has been described in detail.

[0100] FIG. 4C illustrates a schematic enlarged partial side view of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments. In particular embodiments, based on initial set up and indexing, when actuation pin 104 acts to rotate upper crown 204 (such as via actuator interfacing gearing 205) to an angular position corresponding to a drive mode, the castellation teeth of upper crown 204 and lower crown 208 are arranged and aligned such that each set of castellation teeth becomes capable of meshing into the opposing or mating castellation teeth of the other set. As a non-limiting example, projecting teeth of one set of castellation teeth 214 on one crown may, in a drive mode, align with respective gaps within or between castellation teeth 214 of the other set on the other crown, such as to be capable of fitting or otherwise meshing with or within each other. Stated differently, in a drive mode relative angular position between upper crown 204 and lower crown 208, the crowns may be configured to permit relative longitudinal displacement (marked by a double-arrow) or motion by becoming capable of longitudinally collapsing or overlapping relative to each other. As a result, upon collapsing or overlapping each others’ farthest mutually facing longitudinal extents, a combined length of the upper crown 204 and lower crown 208 may be reduced in the drive mode compared to a configuration (to be described further herein) where they may be relatively misaligned and/or otherwise incapable of enabling the mutual intermeshing of each crown’s set of castellation teeth 214.

[0101] FIG. 4D illustrates a schematic sectional partial side view of a bleeder brake capsule in a drive mode, with an exhaust cam on base circle, according to particular embodiments. Based on the configurations described above with reference to FIG. 4C, in particular embodiments, while a biasing action of biasing member 212 may generally act to separate upper crown 204 and lower crown 208 by increasing their relative longidinal distance, biasing member 212 is designed and/or otherwise configured to be insufficiently able to exceed a valve closing force exerted back on plunger 216 by a brake valve, such as via brake socket 224, as a non-limiting example. Accordingly, in particular embodiments in an exhaust cam base circle position in drive mode, prior to opening of a main exhaust valve in an engine cycle, a valve closing force acting on a brake valve may transmit to plunger 216 to further compress biasing member 212 while relatively collapsing or overlapping upper crown 204 and lower crown 208 based on an intermeshing alignment of their respective castellation 214. In particular embodiments, nut 220 may lift off its resting surface on engine braking carrier 14, illustrated in FIG. 4D by gap gT. As a non-limiting example, nut 220 may lift off by a distance corresponding to a sum of heights corresponding to a brake lift height and a lash height, either or both of which heights may be predetermined and/or set in the system. [0102] FIGs. 5A-5D illustrate aspects of a bleeder engine braking system in a drive mode, during a main exhaust stroke, according to particular embodiments.

[0103] FIG. 5A illustrates a valve lift diagram versus engine crank angle in a drive mode of a bleeder engine braking system, during a main exhaust stroke, according to particular embodiments. The relative timing position within the engine cycle illustrated by FIGs. 5A-5D is schematically marked with a solid diamond in FIG. 5A. In this non-limiting example, a main exhaust valve and a brake valve continue to operate in tandem in a drive mode; in this instance, they are both represented to be partially open during an exhaust stroke.

[0104] FIG. 5B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments. As described for FIG. 4B, the actuator pin continues to reside in a (rightward) position within actuation bore 106, corresponding to a drive mode. As a non-limiting example, this position may be enabled by a low pressure oil supply via actuation oil channel 46. As has been described elsewhere herein, this position may alternatively be enabled by other means, such as by selective operation of electromagnets, such as illustrated in FIGs. 9A-B.

[0105] FIG. 5C illustrates a schematic enlarged partial side view of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments. FIG. 5D illustrates a schematic sectional partial side view of a bleeder brake capsule during a main exhaust stroke in a drive mode, according to particular embodiments. Based on the partially open brake valve (which opens downward, in this figure’s frame of reference), plunger 216 is illustrated in this non-limiting example to have lost contact with bridge socket 224 in this phase angle or position within the engine cycle. Consequently, in particular embodiments, with valve closing force no longer acting (upward) through plunger 216, biasing member 212 may act to longitudinally separate upper crown 204 and lower crown 208 to their maximum permissible extent. In particular embodiments, a longitudinal gap (illustrated as a gap gL in FIG. 5C) may open between the farthest longitudinal extents of upper crown 204 and lower crown 208. In particular embodiments, a maximum gap gL during the engine cycle may correspond to a lash height provided between plunger 216 and bridge socket 224. As a non-limiting example, such a lash adjustment height may be provided to enable safe and efficient interoperation of the bleeder brake capsule 26 and engine valvetrain in light of potential thermal expansions, tolerances, wear and tear, and/or other effects. [0106] FIGs. 6A-6D illustrate aspects of a bleeder engine braking system in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. In particular embodiments, in an engine brake (enabled) mode, a main exhaust valve may continue operating through an engine cycle as in a drive or engine braking disabled mode; however, a brake (exhaust) valve may operate differently. Such a system is illustrated herein, as a non-limiting example. With reference to FIGs. 6A-6D, an instant corresponding to a base circle position of such an exhaust cam, i.e., a minimum valve lift position, is illustrated.

[0107] FIG. 6A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments. The relative timing position within the engine cycle illustrated by FIGs. 6A-6D is schematically marked with diamonds in in FIG. 6A. In particular embodiments, a brake valve lift at this instant of FIGs. 6A-6D may initially correspond to the lower hollow diamond indicated in FIG. 6A if the bleeder brake capsule 26 was priorly operating in a drive mode, and is in the process of transitioning to a brake mode. In particular embodiments, a brake valve lift at this instant of FIGs. 6A-6D may correspond to the higher solid or filled-in diamond indicated in FIG. 6A if the bleeder brake capsule 26 has completed transitioning to a brake mode, and is stably operating in a brake mode.

[0108] The remaining FIGs. 6B-6D correspond to the former scenario depicted by the lower valve lift hollow diamond, i.e., for a bleeder brake capsule initially transitioning from a drive mode to an engine brake mode. FIG. 6B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. FIG. 6C illustrates a schematic enlarged partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. FIG. 6D illustrates a schematic sectional partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. [0109] Based on a mode switch from a drive mode to an engine brake mode, high pressure oil may now be supplied to actuator 50 via actuation oil channel 46. As a non-limiting example, Oil Control Valve 18 may enable supply of pressurized oil, such as following receipt of an activation signal to enable engine braking. However, based on an immediately prior state of an engaged drive mode, upper crown 204 and lower crown 208 may still be partially or wholly collapsed and/or interlocking (FIG. 6C), such that the crowns may initially constrain relative rotational motion. Consequently, in particular embodiments, pressurized oil supply or other mode of energizing or activating actuation pin 104 may not initially succeed in translating or otherwise moving actuation pin 104 to its engaged, ‘on,’ or engine brake mode position, as illustrated in FIG. 6B by way of non-limiting example. Similarly, as illustrated in FIG. 6D, a closing force on a brake valve may act on plunger 216 to keep upper crown 204 and lower crown 208 mutually collapsed or overlapping, biasing member 212 compressed, and/or nut 220 lifted over its resting surface, such as by a height gT.

[0110] In particular embodiments, as may be illustrated herein, while a brake valve may follow a main exhaust valve and/or otherwise operate normally (i.e., as in a drive mode) through parts of the exhaust cycle when an engine brake mode is activated, the brake valve may differ from the main exhaust valve in remaining or holding at least partially open throughout the engine cycle, including while the main exhaust valve may close. Stated differently, in particular embodiments during steady state engine braking mode, the brake valve may not close throughout the engine cycle.

[0111] FIGs. 7A-7D illustrate aspects of a bleeder engine braking system in an engine brake mode, during a main exhaust stroke, according to particular embodiments. The particular scenario illustrated in these FIGs. 7A-7D carries further from FIGs. 6A-6D, wherein a bleeder brake system may have been switched to engine brake mode, but may still be transitioning from a prior drive mode configuration.

[0112] FIG. 7A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, during a main exhaust stroke, according to particular embodiments. The relative timing position within the engine cycle illustrated by FIGs. 7A-7D is schematically marked with a solid diamond in FIG. 7A. In this non-limiting example, a main exhaust valve and a brake valve may operate in tandem at this phase or angle within the engine cycle. In particular embodiments during steady operation in an engine brake mode, as indicated by the dotted curve in FIG. 7A, a brake valve may sustain a minimum finite valve lift throughout the engine cycle. [0113] FIG. 7B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments. FIG. 7C illustrates a schematic enlarged partial side view of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments. FIG. 7D illustrates a schematic sectional partial side view of a bleeder brake capsule during a main exhaust stroke in an engine brake mode, according to particular embodiments.

[0114] In particular embodiments, at this phase or angle within the engine cycle corresponding to a main exhaust stroke, based on the brake valve being at least partially opened (by the exhaust cam acting via valve bridge 232, as a non-limiting example), plunger 216 may now lose connection with the brake valve and thereby cease to experience a valve closing force from the brake valve. By way of example and not limitation, this operational aspect is illustrated in FIG. 7D by a gap between plunger 216 and bridge socket 224. Consequently, in particular embodiments, biasing member 212 may longitudinally expand to separate upper crown 204 and lower crown 208, as illustrated in FIG. 7C. In particular embodiments, a gap (such as a gap gt) may open up longitudinally between the upper crown 204 and lower crown 208. In particular embodiments, as upper crown 204 may no longer be rotationally constrained in this separated configuration, upper crown 204 may now rotate to permit actuation pin 104 to finally translate and/or otherwise migrate to its energized, ‘on,’ or engine braking position. Operation of bleeder brake capsule within a selected engine braking mode may proceed on a steady state basis subsequent to this change, within and beyond the particular engine cycle described herein with respect to this transition between states or modes.

[0115] FIGs. 8A-8D illustrate aspects of a bleeder engine braking system in steady state operation in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments.

[0116] FIG. 8A illustrates a valve lift diagram versus engine crank angle in an engine brake mode of a bleeder engine braking system, with an exhaust cam on base circle, according to particular embodiments. The relative timing position within the engine cycle illustrated by FIGs. 8A-8D is schematically marked with a solid diamond in FIG. 8A. In particular embodiments, the remaining discussion for FIGs. 8B-8D may also apply for the steady state position indicated by the solid diamond of FIG. 6A. As has been discussed previously, in a steady state operation in an engine brake mode, the brake valve may differ from the main exhaust valve in remaining or holding at least partially open throughout the engine cycle, including while the main exhaust valve may close.

[0117] FIG. 8B illustrates a schematic partial sectional view of an actuator of a bleeder brake capsule in a steady state engine brake mode, with an exhaust cam on base circle, according to particular embodiments. As illustrated by way of example, actuation pin 104 may continue to be activated or energized while engine brake mode remains ‘on’ or activated. Accordingly, in steady state operation of bleeder brake capsule 26 and actuator 50, actuation pin 104 may hold its ‘on,’ activated, energized, or engine brake mode position (leftward position, in this non-limiting example). Also by way of illustration and not limitation, in particular embodiments, high pressure oil may continue to be provided to actuator 50 via actuation oil channel 46 based on the activated state of engine brake mode, thereby holding actuation pin 104 against a biasing member 108, such as a compressed spring.

[0118] FIG. 8C illustrates a schematic enlarged partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. As described previously, in steady state engine brake mode operation in particular embodiments, upper crown 204 may rotate about longitudinal axis L-L corresponding to an engine brake mode or energized position of actuation pin 104. Based on rotation of upper crown 204 through a specific angle, in particular embodiments, the castellation teeth 214 of upper crown 204 and lower crown 208 may now be configured to be positioned to contact and/or longitudinally constrain each other without permitting relative intermeshing, collapsing, and/or overlapping with each other. Stated differently, in particular embodiments, when configured in a steady state engine brake mode, upper crown 204 and lower crown 208 must have a zero gap or a positive gap between the nearest longitudinal locations between their mutual castellation teeth 214.

[0119] FIG. 8D illustrates a schematic sectional partial side view of a bleeder brake capsule in an engine brake mode, with an exhaust cam on base circle, according to particular embodiments. In particular embodiments during steady state engine brake mode operation in this phase or angle within an engine cycle, based on upper crown 204 and lower crown 208 presenting a longer combined longitudinal structure within bleeder brake valve 26, plunger 216 may act downward on a brake valve to hold it at least partially open by a brake lift height. In particular embodiments, a gap may open up between bridge socket 224 and valve bridge 232 corresponding to brake lift, illustrated in FIG. 8D by gap gv. [0120] FIGs. 9A-9B illustrate a schematic partial sectional top view and operation of an actuator for a bleeder brake capsule, according to particular embodiments. As has been previously discussed, in particular embodiments, actuator 50 may be an electric or electromagnetic actuator. As a non-limiting example, one or more electromagnets, such as electromagnet 120, may be employed to selectively energize or activate actuation pin 104. For example, electromagnet 120 may be deactivated, de-energized, and/or ‘off in FIG. 9A. As illustrated in FIG. 9B, electromagnet 120 may be selectively activated, energized, and/or switched ‘on’ to apply, say, a repulsive magnetic force on actuation pin 104, which may constructed of a suitably responsive material, and acting against a biasing member 108. Multiple transducers and/or biasing members may be inventively arranged to provide a desired actuation effect.

[0121] FIGs. 10A-10E illustrate a non-limiting sequence of steps for setting up a bleeder brake capsule with a desired lash adjustment.

[0122] FIG. 10A illustrates a step in a lash setting procedure for a bleeder brake capsule, according to particular embodiments. Accordingly, in particular embodiments, nut 220 may be initially removed from bleeder brake assembly 26.

[0123] FIGs. 10B1-10B2 illustrate additional steps in a lash setting procedure for a bleeder brake capsule, following the steps of FIG. 10A, according to particular embodiments. Accordingly, in particular embodiments, plunger 216 may be rotated to drive it up and out, such as by using a key or other suitable device within plunger key slot 218, until a suitable slip gauge 310 may be inserted between bridge socket 224 and plunger 216. As a non-limiting example, slip gauge 310 may have a thickness (along longitudinal axis L-L) equal to the difference between an overlapping depth (or height) of castellation teeth 214 and the sum total of a desired brake valve lift and a desired lash gap.

[0124] FIGs. 10C1-10C2 illustrate additional steps in a lash setting procedure for a bleeder brake capsule, following the steps of FIGs. 10B1-10B2, according to particular embodiments. Accordingly, in particular embodiments, plunger 216 may now be rotated in an opposite direction to the rotation of FIGs. 10B1-10B2, such as by using a key or other suitable device within plunger key slot 218 , until resistance is encountered and/ or other confirmation is obtained that lower crown 208 has been raised against compression of biasing member 212 to fully mesh, engage, and come to rest within upper crown 204 (FIG. 10C-2). Any further rotation of plunger 216 in the same direction may drive opening of the brake valve, and is not part of this procedure. [0125] FIG. 10D illustrates an additional step in a lash setting procedure for a bleeder brake capsule, following the steps of FIGs. 10C1-10C2, according to particular embodiments. Accordingly, in particular embodiments, nut 220 may now be tightened and/or a required pretorqued may be applied to nut 220. A correct lash setting procedure to this step of the process may be verified by measuring the gap ‘H’ between nut 220 and its resting surface, such as that of engine braking carrier 14. In particular embodiments, gap ‘H’ may correspond to the overlapping depth (or height) of castellation teeth 214.

[0126] FIG. 10E illustrates an additional step in a lash setting procedure for a bleeder brake capsule, following the steps of FIG. 10D, according to particular embodiments. Accordingly, in particular embodiments, slip gauge 310 may now be removed from bleeder brake capsule 26, and plunger 216 may be allowed to fall through the resulting gap. In particular embodiments, the desired lash may now be considered to be correctly set in bleeder brake assembly 26 relative to guided exhaust valve assembly 20, bridge socket 224, and/or the brake valve.

[0127] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

[0128] While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. It will be understood that changes and modifications may be made by those of ordinary skill within the scope of the following claims. In particular, the present invention covers further embodiments with any combination of features from different embodiments described above and below. Additionally, statements made herein characterizing the invention refer to an embodiment of the invention and not necessarily all embodiments.

[0129] The terms used in the claims should be construed to have the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article “a” or “the” in introducing an element should not be interpreted as being exclusive of a plurality of elements. Likewise, the recitation of “or” should be interpreted as being inclusive, such that the recitation of “A or B” is not exclusive of “A and B,” unless it is clear from the context or the foregoing description that only one of A and B is intended. Further, the recitation of “at least one of A, B and C” should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. Moreover, the recitation of “A, B and/or C” or “at least one of A, B or C” should be interpreted as including any singular entity from the listed elements, e.g., A, any subset from the listed elements, e.g., A and B, or the entire list of elements A, B and C.

[0130] Numerical ranges recited in this application should be construed to be inclusive of the end points of the stated ranges. A longitudinal axis of the upper and lower crowns, which may have been omitted in some illustrations for convenience of scale, should be construed to exist in every illustration or situation where it is referred to.